Round corner case making machine



Feb. 9, 1954 J. E. STRINGER ROUND CORNER CASE MAKING MACHINE 5 Sheets-Sheet 1 Filed Oct. 19, 1950 ZSnventor Jmas' Stringer Gttomeg 1954 J. E. STRINGER ROUND CORNER CASE MAKING MACHINE 5 Sheets-Sheet 2 Filed Oct. 19, 1950 ill 3nventor "5 (Ittomeg Jamal 7. Sin

Feb. 9, 1954 J. E. STRINGER ROUND CORNER CASE MAKING MACHINE 3 Sheets-Sheet 3 Filed Oct. 19, 1950 Snventor Juues E. Jtr

Patented Feb. 9, 1954 UNITED STATES ATENT' OFFICE.

14 Claims.

The present invention relate to bookbinding and more particularly it is an object of this invention to provide a machine that will secure a covering to the cardboard used in book binding.

In the art of custom bookbinding the coverings are of flexible material and are to be placed across one side of and stuck by glue or cement around the edges of a cardboard backing. There have been many unsuccessful attempts to construct a machine capable of automatically folding the covering around the edges of the material. Until now there have been no machines built capable of automatically sticking down the four corners of the covering.

It is therefore an object of this invention to provide a machine capable of doing this.

Another object is to provide a machine capable of sticking down the sides of the covering material automatically as well as sticking down the corners.

Another object is to provide a machine for automatically applying book covering material rapidly and with uniform appearance.

Yet another object of the invention is to provide a device for the purpose described which is sturdy and durable in construction, reliable and eflicient in operation, and relatively simple and inexpensive to manufacture, assemble, and utilize.

Other and further objects and advantages of the present invention will be apparent from the following detailed description and claims and are illustrated in the accompanying drawings which, by way of illustration, show the principles of the invention and a mode in which I have contemplated applying those principles.

Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Figure l is a top plan view of the device of this invention and the platform upon which it is mounted.

A portion of the pulley belt is broken away and an electric motor to power the machine is not shown for convenience of illustration.

Figure 2 is a top plan view of the spring guide used with the invention together with a portion of cardboard which is being covered. The spring guide rod and spring are broken away and a roller wheel is shown in dotted lines.

Figure 3 is a view-in-section taken along the line 33 of Figure 2. A roller wheel is shown partially broken away and the spring guide rod and spring are shown broken away.

Figure 3A is a top plan view of a portion of the rollers and chain. The view is indicated by the line 3A-3A of Figure 5. This partial view of the rollers and chain illustrates the alignment of the rollers with respect to the alignment of the chain. This alignment is not illustrated in the other figures because of the reduced scale and drafting difficulty.

Figure 4 is a front elevation of the entire invention. A work turntable and a portion of the platform are broken away to reveal parts behind. An electric motor is shown in dotted lines.

Figure 5 is a view-in-section taken along lines 5-5 of Figure 1. A side frame member of the roller assembly, portions of the chain rollers, the upper portion of the clamping mechanism, and a portion of the pulley wheel are broken away and shown by dotted lines.

Referring to the drawings for a more particular description and as best shown in Figures 1 and 4, the book covering mechanism 1 0 is mounted upon a rectangular platform [2 which latter is composed of five spaced apart transversely disposed angle iron beams I4.

The beams M are welded at each end to a further pair of spaced apart longitudinally disposed angle iron beams It.

A flat metal plate [8 is welded or otherwise secured over approximately two-thirds of the rectangular area, formed by the beams I4 and it whereby certain portions of the book covering mechanism In may extend below the level of the plate l8 and through the rectangular uncovered area 2o on one side of the platform l2 as later described.

An axle shaft 22 is longitudinally disposed above the uncovered area 20 and is provided with bearings 24 near each end thereof which latter are each maintained in a yoke 26. The ears 28 of the yokes 26 are provided with a threaded aperture 38. One of four threaded bolts 32, transversely disposed with respect to the axle 22, is threadedly received in each aperture 30 and the bolts extend inwardly to bear against the sides of the bearings 24 to adjustably align the axle 22. A nut 34 is provided for each bolt 32 and the nuts 34 are disposed against the sides of the yoke ears 28 to lock the bolts 32 in position.

The two yokes 26 are each provided with two oppositely disposed flange footings 36. Each footing 36 is disposed above a cylindrical metal post 38 and secured thereto by a machine bolt 3 40 which latter extends through an aperture in each footing 36 and is threaded into the top of each post 38.

The posts 38 rest upon the transversely disposed angle iron beams I I and are each provided at their bottoms with a threaded pin 42 which latter extends through apertures provided through the transverse angle iron beams It. Nuts 42 are disposed on the threaded pin 42 for securing the posts 38 to the angle irons IA.

The inward portion of the shaft 22 is secured to a large pulley wheel 44 which latter is in transverse alignment with the pulley wheel 46 of an electric motor 48 located below the platform I2 and shown in dotted lines in Figure 4.

A pulley belt 50 encircles the two wheels at and dB for transmitting rotary motion to the axle shaft 22. A further pulley wheel 52 is secured to the axle shaft 22 at a position between the bearings 24 and closely adjacent the innermost bearing 24 for purposes .later described.

An elongated rectangular shelf 60, transversely disposed and .spaced above the platform I2, is positioned between the yokes .26 and below the axle shaft 22 with an outer end overhanging the. uncovered area 29. i

The shelf 66 is supported upon two narrow parallel metal blocks 62 whichare positioned on the platform plate 18 and are located one on each transverse side of the shelf 60.

The shelf 68 and blocks 62 are .secured togather .and secured to the platform plate I8 by machine screws which latter are not shown in order to more clearly illustrate other parts.

As bestshown inFigure '5, a lower short longitudinally disposed shaft 64, located directly below and aligned with the described axle shaft 22, is supported beneath the overhanging portion of theshelf 61] .by means .of two spacedapart bearing blocks .66.

The bearing blocks 66are secured to the underside .of the shelf 60 by machine screws which latter are not shown in order to better illustrate other parts.

The bearing blocks 65 are provided with axially;

aligned apertures 68 through which the shaft 64 extends. The innermost .end .of the shaft 64 is secured to a small pulley wheel I located below the pulley wheel 52. A pulley belt 12 encircles the pulley wheels and 52 in order to drive the lower shaft 64.

Located between the bearing blocks .66 and secured to the shaft I54, a worm screw .14 is located which .is in mesh with a horizontally disposed .gear wheel .16.

A vertical bearing sleeve 18 is disposed through an aperture 80, which latter is located at the center of the shelf 60. The sleeve 18 is secured to the shelf 60 by welding or other suitable means.

The lower end of a vertical shaft 82 is secured to vthe gear wheel Hi. The vertical shaft 82 extends through the sleeve 18. The upper end of .the shaft 82 is secured to a pair of horizontally disposed knurled wheels v8t one located above the other.

The knurled wheels 84 receive rotary motion from the worm gears 14 and 16 in order to revolve a small turntable upon which the covering material is placed, as later described.

Two spaced apart parallel elongated bars 90 extend inwardly at right angles from the upper axle shaft 22. The bars 90 are located above the center of the shelf 60. The outer ends of the bars *90 adjacent "the axle 22 are each provided with an axially aligned transverse aperture. Two short bearing sleeves 94 are provided, one disposed in each aperture 92.

The axle 22 is disposed through the sleeves 94 and through a small sprocket wheel 96 which latter is secured to the axle 22 in between the two parallel bars 2%.

The opposite ends of each bar 98 are provided with axially aligned transverse apertures 98 through which extend a small axle pin Iilil. A further small sprocket wheel i332 is secured to the axle pin i681 and mounted between the bars 90.

Equally spaced apart from themselves and .equallyspaced apart from the two sprocket wheels and an are two transverse spacers Hi3 welded transversely in between the bars forstrengthening the structure.

A roller chain iilt encircles the two sprocket wheels 96 and W2 and, as best shown in Figure a, each outer link I88 on each side of the chain is provided with an ear or tang Iii) which is integral with the link I98 and extends upwardly therefrom at a right angle with respect to the axis of the roller chain Iilt.

Each tang i ii is provided with an aperture 1 I3 through which an axle pin II l is disposed. The axle pin i it extends between each pair of tangs IIIZ.

A small roller wheel generally indicated at I -IB comprises a coverin folding portion I I5 which latter is made of a substantially incompressible material such as steel and a smoothing portion I-E'l for flattening the covering, which latter is made of rubber or similar material. The roller wheel H6 is mounted on the axle pins [M between each parallel tang I I5).

The steel folding-portion II 5-is disc-shapedand is provided with a knife edge I I8 around its-outer perimeter. It is also provided with an elongated cylindrical outwardly protruding hub which 'latter is journaled about the axis pin I I4. The rubber portion I I! is cylindrical inshape and is disposed about the outer perimeter-of the "hub of the steel portion 1! I5. 7

The perimeters of the rubber rollers IIB are provided with integral transversely disposed-elongated teeth I-II' making alternate ridges and furrows across the rollers I I6.

As shown in Figure 3A, each tang III) is not in alignment with the link I98 with which it is integral. With respect to or in comparison with an exact alignment of the tangs -I Hi to :the links IE8, as indicated by the line H8, the tangs 410 have been twisted. or turned slightly in accunterclockwise directicn to the alignment indicated by the line I it). The-roller wheels I I6 are-aligned with the twisted or turned tangs I It.

The purpose of providin slightly clockwiseturned-tangs i it and roller wheels i I6 is to compensate for the relativ motion between the rollers H6 and a turntable which carries the bookbinding material being sealed together. The turntable will be described later.

As best shown in Figures 1 and 5, a'metal block i2Il is secured alongside the innermost parallel bar by welding or other suitable means. A machine bolt I22, secured to the center of the block I28, extends horizontally and outwardly therefrom.

An elongated vertical rod "I2 3 is provided with a nut I26 threaded adjacent to it lower end. The rod I22 is threaded into a tapped hole in the shelf Bil and extends therefrom upwardly to bear against the underside of the machine screw I22. The rod "I28 thereby provides a support for the parallel bars I20 and attached mechanism which is adjustable in height by turning the rod further in or out of the shelf 60.

An integral rectangular portion I28 of the block I20 extends downwardly therefrom and is provided with a horizontal slot I30 disposed parallel with the two bars 80. v

A thin plate-I32 is placed overlapping the slot I36 and is secured to the rectangular portion I20 by two metal screws I34 which are best shown in Figure 1. The slot I30 slidably carries an elongated square rod I86 which latter extends through the slot I30.

- As best shown by Figures 2 and 3, the inwardly extending end of the square rod I86 is welded to the backside of a covering material upturning member or guiding spoon I38. The spoon I38 is approximately L-shaped in cross section, having an upstanding wall I46 rounded into a forwardly extending flat portion I 42.

A horizontal, generally rectangular, thin plate I44 is integrally formed to the lower end of the wall I40 and extends under the forward end of the rod I36.

A narrow block or shoe I46 is cemented to the upper surface of the plate I44 and positioned directly beneath the rubber rollers I I6. The outer end of the shoe I46 is beveled to form an incline whereby the rollers H6, upon traveling over the shoe, become compressed before rolling onto the covering material as the latter is being sealed together as later described.

An elongated compression spring I48 disposed about the square rod I36 abuts the block I28 and the back side of the upstanding wall I40 in order to urge the guiding spoon I38 forward for reasons later described.

An annular boss I60 provided with a flange I62 is secured to the metal plate I8 of the platform [2 by bolts I 63.

A vertical post I64 is secured into the center of the boss I60 by welding or other suitable means. The boss I60 and post I64 are located on the same side of the platform I2 as the axle shaft 22 and at the corner of the platform I2.

A jointed turntable supporting frame will now be described.

Two spaced apart beams I66 extend inwardly over the platform I2, one from the top of the post I64 and one from the bottom.

Both beams IE6 are provided at each of their ends with vertically disposed bearing holes I68. The post I64 extends through those two of the holes I68 which are disposed through the inward ends of the beams 068. An elongated vertical axle pin I extends through the two holes I68 and in the outward ends of the beams I66.

Two spaced apart upright braces I12 extend inbetween the beams I 66 and are welded thereto. A diagonal brace I18 extends from the top of one upright brace I12 to the base of the other brace I12 to strengthen the framework.

A sleeve I14 is rotatably disposed about the pin I10 inbetween the beams I66. An elongated horizontal pipe I16, welded to the lower end of the sleeve I14, is disposed above the surface of the platform I2 and extends in front of the shelf 60.

A further pipe I18 welded to the lower end of the sleeve I14 extends at an angle upwardly over the horizontal pipe I16.

A short, horizontal pipe I80 welded to the top of the sleeve I14 extends to and is welded to the pipe I18.

Welded to the top of the pipe I18 a further short length of pipe I82, aligned withand dis- 6 posed above the lower described pipe I 16, extends in front of the shelf 60.

A square bearing block I 84, provided with a vertical hole I86, is welded to the end of the pipe I82. Another square bearing block I88 is welded to the end of the lower pipe I16 and is provided with a hole I which latter is axially aligned and vertically below the hole I86 of, the block I84.

A vertical rod I82 provided with a knob. I84 at its top is disposed through the hole I in the top block I84. A circular clamp I is rotatably secured to the lower end of the rod I92.

A cotter pin I96 is disposed through a horizontal aperture I88 provided transversely through the rod I92 above the clamp I94. A compression spring 200, disposed about the rod I92, abuts the top bearing block, I88 and lodges against the cotter pin I66 for urging the clamp I95 and rod I82 downwardly at all times.

As best shown in Figures 1 and 5, a backing member or turntable 2) is provided with a horizontally disposed rectangular plate 2I2. The corners of the plate 2 I2 are rounded. A side wall, or downwardly extending flange 2 I4 of the turntable 2I0 is integrally formed to, and extends downwardly from, the perimeter of the plate 2 I2.

A vertically disposed post 2I6 is welded underneath and at the center of the plate 2I2. The post 2I6 extends downwardly from the plate 2 I2 and is disposed through the hole I98 in the lower block I88. A nut 2 I8 is threadedly disposed about a threaded lower end of the post 2I6 to rotatably secure the post 2 I6 to the lower block I88.

As best shown in Figure 5, a wide rubber facing 220 extends around the perimeter of the turntable 2I0 to provide a surface against which the two knurled wheels 84 turn without slipping.

A fiat metal bar 222 is normally transversely disposed across the inner end of the shelf 60. A machine bolt 224, provided with a washer 226, is disposed through an aperture at one end of the bar 222 and secured into the upper side of the shelf 60, whereby the bar 222 is able to pivot from one end. A further machine bolt 228 is secured to the other end of the bar 222, to which is attached a tension spring 230. The spring 230 extends to a threaded shank eyebolt 232 at the opposite end of the shelf 60.

The eyebolt 232 is disposed through an aperture 234 provided in an upstanding short post 236. A nut 238 is threaded to the end of the eyebolt 232 and drawn down against the post 236 in order to tighten the spring 230. A machine bolt 240 extends upwardly through a suitable aperture provided through the shelf 60, and is threaded into the lower end of the post 236.

Disposed within the turntable 2 I0 opposite the two knurled wheels 84, a large metal roller wheel 242 is provided which is rotatably mounted upon a short vertical axle 244.

The axle 244 is welded or otherwise secured to the center of the pivot plate 222, whereby the tension of the spring 230 urges the metal roller wheel 242 against the sidewall flange 2I4 of the turntable 2I0 and forces the turntable against the knurled wheels 84.

A thin metal backing pan or plate 258, rectangular in shape and having rounded corners, is secured upon a smaller plate 252 of similar shape, although thicker. The plate 252, is secured tothe upper surface at the center of the turntable and serves to space the backing plate or member 250 above the turntable 2I0. As best anaemia E showniini-Figuressazandab} the athin metal. backe ing plate 250 extends over thenforwardly extend-i ing portion I425of the guidespoonzl 38.21

A rectangular piece. of the sandpaper; 21514115 glued: tothe upper: surfacev of the-i metallplate: 50": to: provide azsurface upon; which? to: P130833; covering 2 5.6 and the-cardboardt258 ;to be .covered:

In operation, the covering? 2.56. is: pre-ecut; to overlap the size of the cardboard 258 to bezcoviered and placed upon the sandpaper: top of the plate 2 50; The shape and .SiZB'i of P thev cardboard 258: and 'coveringa256 is similar to the shape and size of the backing pan or.-plate 250'.- Theclamp I951 is lowered to hold the material in placetupon the turntable 21 0 by: the'pressure of the spring. 200% The electric motor- 48 1s :turned on causing the elongatedishaf-t fiq together with the worm gear TW- to revolve.

The knurled wheels fi l driven bythe worm gear TB bea-r tightly against the rubber: band2l4 of 'theturntable 210-; causing it' torevolve in: a

counterclockwise direction, as shownzby the arrow Nil-in Figure 2;

Before placing thework on the. machinethe covering 25S-is -coated with-gluev Thecardb'oard is laid' on=it and the" assembly isthen placed under theclamp 1951 The overlapping edge of thecovering 256 is-turned upwardly by the guide spoon l 38' before passing in-front of the rubberv rollers I I6:

The rubber rollers llfi -and the chain lllfi re volve in'a clockwise direction -as shown in-Figure 5"; Each successive "roller! lt passes upand "on the tensioning block or shoe I46 and rolls approximately transverse across the overlapping edge of -the covering'256; thereby sealing the-covering 2'56 tothe perimeter of "the cardboard 258-.

Sincathe-rollers I iii are turned slightly counterclockwise, they will-not skid orskufftheccvering 256 asthey; roll across the overlapping edge portion of the covering 2 5 5.

After a: full rotation of theturntable the clamp 1 95 is'raisedby-the knob 194-, the covered card-board is removed and the process isrepeated.

At 'timeswhen' a large cardboard is to be covered; a: large backing pan -or"plate"25ll* is-substituted' f on the one formerly used. Variations in shape and size are used as'needed.

This-machine"has-provided a machine forfoldingflexibl'e covering material about stiffer'material automatically'for performing this operation more economically'tha'n' has ever beerr heretoforepossible.

From the foregoingdescription, it"is thought to be obvious that a round cornercasamaking machine constructed in accordance w'rth my in"- ventionis particularlywell adapted for use; by reason of'the'convenienceand facility with which it may 'be" assembled andoperated; and it" will also be obvious that my invention. is susceptible of some change" and 1 modification." without' de-.- parting from the principlesandspirit' thereof; and'forxthis reason'Ido notwishto be understood as limiting myselfto the'precise arrangement andtformation of the several "parts herein shown in carrying out my invention in practice, exceptas claimed;

1. claim:

1'; A'machine for foldingthe edgcportionsof' havingz a down-turned;flangevomtheaunder sidetlrereof, said; flange ;having 5 an outer side having; a: shapeeinxa view lookinggdownwardly from said fiat surface of; acontour: parallel; tov the outer edgezof ,saidipiece; ,means mounting, said backing member; onqsaidj frame; such that vit? is: free to move with respect to said framein all directions in; a plane in -parallelism with said flat surface; clamp, means for .-holding;said piece againstsaid covering; whenisaid covering is disposed 7 on said flats surface; a. rotating drive member mounted on @saidiframe, said drivemember being disposed against the outer side of said flange and; drivably; en aged itherewith for causing said backing -memher: to move in a ;path;complemental :to theeconetour;- of; the: outer; edge; ofsaid piece; a1. roller wheel disposed 'on thes nward sideiofgsai, d=;fla11ge;

, meanszsecuringsaid roller-- wheel to saidnfram-e and urging-.1 said rollerx wheel itoward; said drive. member; up-turning means forcausingtheouter edge: portion of; said 1 cover -tmbe bent-upwardly from said; surface;-; a; plurality of. rollers; and means;forrcausinggsaidfrollers;tOg-Pass-alternatelyacross said backing member while pressing;there-= against, said; rollers; each: moving across; said backing-,memberfrom-the outside thereeftovvard thew-inner side thereof; transversely of the-path of; saidi backing member, movement, and; said rollers each movingacross saidbacking member at; as peintdisposedcloselydn-frontrof said cov-- ering; Lip-turning; means with respecti-to thee di,-= rection of movement of. that;p ortion1 of? said backing; member. which" is.- closest. tossaid: upturning, means.

ZQXA machinefcnfolding the edgfi nortionsbfi a;-cov-eri-ng;around theedge of :a pieceofrelatively, stiff material comprising:; a frame; a-ibacking; member; having-1 as fiat surface :fOI? receiving said covering thereagainst; means mounting; saidbacking member on said frame such'thatit-isfree tomeve with respect, to said; frame inT-all-directionsyin a plane in parallelismzwith said flat'sur: face;- clamp means: for; holding said piece against said coyeringwhen said coyering-fiadisposed on said mat; surface; means --for.=-causing said backing; member to; move? in a, path :complementalgto the contour of the outer edge of said piece; .up turn: inai means for causing :the :outer: edge portion: of said ccverrto-be bentiupyvardly from-said surfaces a plurality of rollers; qandimeans for causing said rollers; to; pass alternately; across said backin member-while -pressi1ig;;.thereagainst,- said-rollers each; moving i across said backing-. member fromthe; outside thereof rtowardcthezinner "side :thereofzi ing. member; having: a1; fiat, surface forr'receivin'gz said coveringgthereagainst, said-backing member;

having-7. a :down-turned: flange on, the J under; side'- thereof, said flange having antouter side having alshape; in .ai. view looking downwardly from saidflat surface of a contour-parallel' 'to the-outer edge of said-piece means-mounting-said backing memberon said-frame such that it is free-to move with respect to said frame in all directions invaplane-in parallelism with said'flat surface: ,clamp meansfor holding said piece against saidi'cover ing when said covering is disposed on said fiat surface; a rotatin drive member mounted on said frame; said drive member being disposed against the outer side of said flange and drivably engaged therewith for causing said backing member to move in a path complemental to the contour of the outer edge of said piece; a roller disposed on the inward side of said flange; means securing said roller to said frame and urging said roller toward said drive member; up-turning means for causing the outer edge portion of said cover to be bent upwardly from said surface; and means for causing said covering to be folded around the edge of said piece and pressed against that side of said piece which is opposite said surface for causing adhesive to stick said folded edge portion of said covering to said opposite side of said piece.

4. A machine for folding the edge portions of a covering around the edge of a piece of relatively stiff material comprising: a frame; a backing member having a flat surface for receiving said covering thereagainst; means mounting said backing member on said frame such that it is free to move with respect to said frame in all directions in a plane in parallelism with said flat surface; clamp means for holding said piece against said covering when said covering is disposed on said fiat surface; means for causing said backing member to move in a path complemental to the contour of the outer edge of said piece; an up-turning member having a surface inclinedly disposed with respect to the path of movement of said backing member, said inclined surface being closer to said path at that end of said inclined surface which is disposed rearwardly in the direction of movement of adjacent portions of said backing member and farther from said path at its other end; and means for causin said covering to be folded around the edge of said piece and pressed against that side of said piece which is opposite said surface for causing adhesive to stick said folded edge portion of said covering to said opposite side of said piece.

5. A machine for folding the edge portions of a covering around the edge of a piece of relatively stiff material comprising: a frame; a backing member having a flat surface for receiving said covering thereagainst; means mounting said backing member on said frame such that it is free to move with respect to said frame in all directions in a plane in parallelism with said flat surface; clamp means for holding said piece against said covering when said covering is disposed on said flat surface; means for causing said backing member to move in a path complemental to the contour of the outer edge of said piece; up-turning means for causing the outer edge portion of said cover to be bent upwardly from said surface; a plurality of rollers; and means for causing said rollers to pass alternately across said backing member while pressing thereagainst, said rollers each moving across said backing member from the outside thereof toward the inner side thereof transversely of the path of saidbacking member movement, said rollers each moving across said backin member at a point disposed closely in front of said covering upturning means with respect to the direction of movement of that portion of said backing me her which is closest to said up-turning means, and said rollers each having a circumferential surface provided with a plurality of alternate ridges and furrows extending thereacross in parallelism with its axis.

6. A machine for folding the edge portions of a covering around the edge of a piece of relatively stiff material comprising: a frame; a backing member having a flat surface for receiving said covering thereagainst; means mounting said backing member on said frame such that it is free to move with respect to said frame in all directions in a plane in parallelism with said fiat surface; clamp means for holding said piece against said covering when said covering is disposed on said flat surface; means for causing said backing member to move in a path complemental to the contour of the outer edge of said piece; up-turning means for causing the outer edge portion of said cover to be bent upwardly from said surface; means for causing said covering to be folded around theedge of said piece and pressed against that side of said piece which is opposite said surface for causing adhesive to stick said folded edge portion of said covering to said opposite side of said piece.

7. A machine for folding the edge portions of a covering around the edge of a piece of relatively stiff material comprising: a frame; a backing member having an approximately fiat surface for receiving said covering thereagainst; means mounting said backing member on said frame such that it is free to move with respect to said frame in all directions in a plane in parallelism with said fiat surface; clamp means for holding said piece against said covering when said covering is disposed on said, fiat surface; means for causing said backing member to move in a path complemental to the contour of the outer edge of said piece; upturning means for causing the outer edge portion of said cover to be bent upwardly from said surface; at least one roller, said roller having an end edge axis-surrounding portion of its periphery formed of hard substantially incompressible material, the axis-surrounding remainder of said roller periphery being formed of resilient compressible material, said resilient portion of said periphery having alternate ridges and furrows extending parallel to the axis of said roller; means for causing said roller to pass across said moving backing member while pressing against said covering, said passing of said roller being in a path from the outer edge of said material toward the inner portion thereof; and means for causing said roller to return to a position for a repetition of said passing movement, said roller not being in contact with said covering on its return motion.

8. A machine for folding the edge portions of a covering around the edge of a piece of relatively stiff material comprising: a frame; a backing member having an approximately flat surface for receiving said covering thereagainst; means mounting said backing member on said frame such that it is free to move with respect to said frame in all directions in a plane in parallelism with said fiat surface; clamp means for holding said piece against said covering when said covering is disposed on said flat surface; means for causing said backing member to move in a path complemental to the contour of the outer edge of said piece; upturning means for causing the outer edge portion of said cover to be bent .upwardly from said surface; at least one roller, said roller having an end edge axis-surrounding portion of its periphery formed of hard substantially incompressible material, the axis-surrounding remainder of said roller periphery being formed of resilient compressible material; means for causing said roller to pass across said moving backing member while pressing =aga inst==said covering saidpassing:- ofsaid-rollers 'bein'giina path from the outer edge of i said material toward-the innerportion thereof; :and means ''for causing said roller to return to a position for a repetition of said-passingmovement, said roller not being in contact with said coveringon' its return motion.

-9."Amachine for folding theedge-portions of 'a covering around thee'dge of a piece of relatively stiff material comprising: :a frame; a backing member havingan -.approximately fiat surface for "receiving said covering thereagainst; means mountingsaid backingmember on said frame such that it is free' to movewith respect to said framein all directions in -a plane in parallelism With-said'fia'tsurface; clamp meansfor holding said-piece against' said covering when said covering -is 'disposed on said fiat surface; means for causingsai'd'rbatzkingmember to :move in a path complemental to the contour of the outer edge of said piece; upturningmeans for-causing the outer edge portion of i said oover -to be-bent -up- Wardly from saidsurfaceyatleast one roller, said rollefihaving a disc-shaped 'folding portion at one side, means 'for causing said 'rollerto pass across said-moving 'backing member while pressing against said covering, said passing 'of said rollers being in a -path from the outer edge of sa id 'material toward the inner portion thereof, saidmoller passing 'being in a path fixed with respect to said frame and transverse with respect to thed-irection of movement ofthose portions (if sai'd back-ing member disposed nearest said rllen'at'the'time of'firstroller contact with? said covering; :and means 'for'causing said roller to r'turnto a position for a repetition of saidpassing 'movement, 'said roller 'not'being in contact withsaid covering on its return motion.

10.. A=machineforflding theedge portions of a covering -aroun'd the edge of a piece of relativelystiff materialcomprising: a'frame; abacking member having an approximately flat surface for receiving said covering 'thereagainst; means mounting said backing member on said frame suchthat it isfree to move'with respect to said'frame in all directionsin a plane in parall-lism with saidflatsurfacey' clamp means for holding said piece 'against saidcovering when said coveringis' disposed o'n'said flat surface; means for causing' said backing member to move in :a path complemental to'the contour of the outer e'd'ge' of said Ipiece; upturnin'g' means for causing the outer edge portion of said'coven'tobe bent upwardly from=said surface; at. least one roller; meansfor causingisaidro'ller to 'p'ass'across said moving backingimember "while pressing against said :covering, said passing of *said' rollers being in :a :path from? the outer" edge of said material toward theiinnerportion thereof ,'-said roller passing -l e 'g in ta .Ipath tfixed' with respect to said frame and transverse" with L respect to :the direction ofimovementiofithose "portions of said backingtmember disposed :nearest' said roller at the timeofifirst roller contactwith saidcovering; andfmeans for causing said roller to return to aiposition'for a repetition of "said passing movement said roller-not 'beingiin contact with said covering on' its return motion.

311. -Aimachine for folding the edge portions of a covering-around the :edge of a piece of relatively stiff material -comprising: -a frame; a backing member having an approximately mat surface for receiving: said covering thereagainst' means mounting said ba'cking member on sai" frame such that it is free to "move with respect to said frame in all directions in a plane in parallelism with' saidiflat z surface clampi means 'for holding said: piece against said covering -when said -covering is 'disposed on: said flat surface; means f for causing 1 said Jbacking member to move in' a' path complemental'to'ithe contour of-the outer edge-of said ipiece; upturning .lmeans for causing the outer edge lportion of said cover -to be 'bent 41pwardly: from' -said surface :at least 'one roller,- said roller having an enddge axisesurrounding portiona.iofiits'peripher iformed of har d substantialiy incompressible"material, 'said and edge portion having a circular periphery of a dull knifeedge "shape, ':'-the axisesurroun'ding -'remainder of said'rrollertperiphery being' forme'd "of resilient compressible Fmaterial; imeans for causing said roller to :"pass across "said moving iibacking member while *:pressing against said covering, said pass'ingto'f said rollers being in apath'from the outeriedgezoi said: materialtoward theinner portion thereof and '.m'eans for f causing said roller to :return :to a: position for a repetition o'f sa'id passingz'move'ment, said' roller 'not' being in contact with said covering on its :return motion.

.12. in a case; making 'smachine, 'the 'combination whi'ch comprises a :mounting platform, *a horizontally "disposed turntable "journalied' on sai'd platform-ta backing plate positioned onsaid turntable, a" substantially L-ishaped f spoon" having #an arcuate? face1mounted.ontsaid Lplatform and positioned at oneisideiofi'said turntable; said backing platepositioned toireceive -'a covering sheet, a sheet of z-relative'ly stiflimaterial 'adapted' to be positioned 'on said 'zcoverin-g I sheet, -a clamping member for clamping said' sheet'ofrekitivlystiif material upon said coveringf isheet an'd backing plate; an-endless 'e'hainipositioned"to travel transversely across 'anedge :of saidislieet of relatively stiff material resilient Tmeans for urging said clamping .member "toward said covering :sheet, rollers carried by said "chain and positioned to coact-With saidspocntotfoldtheaedge of said covering-sheet againstsaid sheet of relativelysti'if material, means rotating r=said ?turntable, -and means actuating saidend'less T'chain.

.13. A case makixrgzmachine as "describedin claim 12, wherein discs havin'g' knife edges "are positioned at oneendoi each of said rollers carried by the endless chain.

14.45. case .1 making machine :as "described'in claim :12, rwherein-isaid turntable: isi'provide'd with a depending-flange and the'rotatingfmeans'therefor includes knurledw ertically positioned Wheels outside of the flange coacting with a resiliently mounted roller "wheel" acting against :the inside of the-flange.

References Cited 7 in the file i of this "patent UNITED STATES PAT-ENTS Number "Name Date 7 2,669,885 Jefireys .Febn 9, 1937 "244L Balsam et a1. LMay 11,4948 2150I733 'Merz Mar...28,..1950 25536210 Ort'et a1 .Jan. 2, 1951 

